28503216 has 60 divisors (see below), whose sum is σ = 91168272. Its totient is φ = 8143488.

The previous prime is 28503199. The next prime is 28503221. The reversal of 28503216 is 61230582.

It is a self number, because there is not a number n which added to its sum of digits gives 28503216.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13131 + ... + 15146.

Almost surely, 2^28503216 is an apocalyptic number.

It is an amenable number.

28503216 is an abundant number, since it is smaller than the sum of its proper divisors (62665056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28503216 is a wasteful number, since it uses less digits than its factorization.

28503216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28298 (or 28289 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28503216 is about 5338.8403235160. The cubic root of 28503216 is about 305.4672262052.

Adding to 28503216 its reverse (61230582), we get a palindrome (89733798).

The spelling of 28503216 in words is "twenty-eight million, five hundred three thousand, two hundred sixteen".